[Sync] Refactor sync datatype error handling.

chrome/browser/sync/glue/syncable_service_adapter.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_SYNC_GLUE_SYNCABLE_SERVICE_ADAPTER_H_
 #define CHROME_BROWSER_SYNC_GLUE_SYNCABLE_SERVICE_ADAPTER_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 11 matching lines @@
 // services. Implements the model associator interface, invoking the
 // provided SyncableService as necessary.
 class SyncableServiceAdapter : public AssociatorInterface {
  public:
   SyncableServiceAdapter(syncable::ModelType type,
                          SyncableService* service,
                          GenericChangeProcessor* sync_processor);
   virtual ~SyncableServiceAdapter();
 
   // AssociatorInterface implementation.
-  virtual bool AssociateModels() OVERRIDE;
-  virtual bool DisassociateModels() OVERRIDE;
+  virtual bool AssociateModels(SyncError* error) OVERRIDE;
+  virtual bool DisassociateModels(SyncError* error) OVERRIDE;
   virtual bool SyncModelHasUserCreatedNodes(bool* has_nodes) OVERRIDE;
   virtual void AbortAssociation() OVERRIDE;
   virtual bool CryptoReadyIfNecessary() OVERRIDE;
 
  private:
   // Whether the SyncableService we wrap is currently syncing or not.
   bool syncing_;
 
   // The data type being provided by this service.
   syncable::ModelType type_;
 
   // A pointer to the actual local syncable service, which performs all the
   // real work.
   SyncableService* service_;
 
   // The datatype's SyncChange handler that interacts with the sync db.
   GenericChangeProcessor* sync_processor_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncableServiceAdapter);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_SYNCABLE_SERVICE_ADAPTER_H_